1H nuclear magnetic resonance study of low-temperature water dynamics in a water-soaked perfluorosulfonic acid ionomer Nafion film

Jun Hee Han, Kyu Won Lee, Cheol Eui Lee

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We have employed proton nuclear magnetic resonance (NMR) spectroscopy in order to study the low-temperature water dynamics in a water-soaked perfluorosulfonic acid ionomer Nafion (NR-211) film. According to the recent models, Nafion may comprise water strongly bound to the sulfonic acid group, hydration water, and condensed water species. In this work, three separate NMR peaks from the water species revealing distinct behaviors were identified. A significant portion of the ”bound” water remained unfrozen down to 200 K, whereas a slow-to-fast motional limit transition was observed at TM=220 K from the relaxation measurements.

Original languageEnglish
Pages (from-to)28-30
Number of pages3
JournalSolid State Communications
Volume250
DOIs
Publication statusPublished - 2017 Jan 1

Keywords

  • A. Water-soaked Nafion film
  • D. Non-freezing water dynamics
  • E. Proton nuclear magnetic resonance spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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